Stamp



FIG. 1 is a front perspective view of a stamp showing our new design;

FIG. 2 is a rear elevation thereof,

FIG. 3 is a left elevation thereof,

FIG. 4 is a right elevation thereof,

FIG. 5 is a top plan view thereof,

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof. 

The ornamental design for a stamp, as shown and described. 